Water back for furnaces



Feb. 5,1929. I v 1,701,480 r R A. FORESMAN I ATER BACK-FOR FURNACES Filed June' 1924 2 Sheets-Sheet 1 v '2 N wnmzssss; 1 :3 INVENTOR 6. R-A-Foresmnn. Y BY 616M 4 ATTORNEY R. FoREsMAN WATER BACK FOR FURNACE Feb. 5, 1929,

IillLJune 9; 1924 WITNESSES:

STAT

amass rA'TN Fries.

aornn'r is. FORESMAN,

OF MOORE, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC 5 MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

WATER BACK FOR FURNACES.

Applicatien filed June 9,

Mv invention relates to furnaces, and particularly to furnaces in which clinker pits are employed for receiving the solid products of combustion, and it has for an object to provide an apparatus of the class referred to which is of improved construction and arrangement of parts.

in operating furnaces of this character it is the usual custom to maintain a considerable amount of refuse 1n the clinker pit; the purpose of which is to provide a seal for preventing the undesirable admission of the furnace, and cool before coming in 'conta er rolls. Heretofore consi ct with the air to also to permit the refuse to grindderable d ifiiculty has been encountered at the rear of the furnace by reason of the molten slag refuse adhering nace contiguous to objectionable formation the upper portions of the rear wall pit interferes materially ing of the fuel; both for the reason large amount of combustible material trained in be consumed; and, large clinker mass form feeding of tion of the pit.

the clinker pit.

in the to the rear wall of the'fur- This of clinker masses on of the with the final burnthat a is enthe clinker and therefore cannot for the reason that this tends to prevent the unithe refuse to the lower por- Also in priorapparatus no means has been provided for hastening the cooling of the refuse within the pit, which would prevent unnecessary damage to the side walls thereof. Also, heretofore the heat More particularly, therefore, the obj off from the refuse within the usefi ll ects of this invention are comprised in the provision of an improved wallconstructlon at the rear of the furnace, which will prevent the formation of clinkers thereon, which will hasten the cooling of the refuse within the clinker of the heat dissipated' from the refuse and which will provide for the utilization within the pit in an extremely efficient manner.

These and other objects which are more manifest scription thereof,

of this invention, in the further demay be attained by .the apparatus illustrated in the accompanying drawin in which .ofa

Fig. 1 is a view in section high temperature furnace embodying my invention; Fig. 2 is a view in section on line HII of Fig. 1 Fig. 3 is a view tion showing the means for tiles to the tubes and taken on line II in secfastening the 1924. Seria1 No.718,942.

of Fig. 1; Figs. 4 and 5 are views in section, illustrating modifications of the tile construction shown in Fig. 3; and Fig. 6 is a View in section illustrating a modification in which a plurality of rows of tubes are used.

According to one aspect of this invention, I provide a boiler furnace having a progressive feed stoker for feeding and burning the fuel; a clinker pit extending below and arranged to receive the refuse from the discharge end of the stoker; clinker grinder rolls disposed within the lower portion of the pit; and a rear wall of the clinker pit comprising a plurality of spaced substantially upright tubes through which cooling fluid is adapted to circulate, a header connecting the lower ends of the tubes, and refractory tiles engaging the tubes and providing a contacting sur face for the refuse within the pit. By reason of this construction the water circulating within the tubes will hasten the cooling action of the refuse within the pit, will utilize the dissipated heat from this refuse, and, in addition, will prevent the clinkers from adheringto the refractory tiles.

Referring to the drawings for more (16- tailed description of my inventioml show at 10 a high temperature boiler furnace having a front wall 11, a rear wall12 and side walls 13. A boiler 14: of the tubular type is mounted above the furnace and a stoker 16,- and refuse pit 17 having clinker grinderrolls 18, 18 are disposed at the bottom of the furnace, all of which is a well known constructional arrangement. The rear wall 12 of the furnace 10 consists of two horizontally-extending headers 21 and 22 between which extend the vertically disposed tubes 23 spaced apart, as shown in Figs. 2 to 5, sufliciently to permit the securing of tiles 25 thereto. The tiles are made of cast iron or other refractory material and are of a width substantially equal to the distance between the centers of the tubes and have a plane face 26 and arcuatesurfaces 27 109 at the rear conforming with the curvature of the tubes; The tiles are each provided with a T-shaped slot 28 opening from the back, in which the bolts 29 are adapted to be inserted. The. tiles are assembled against the tubes, and the bolts being placed in the T-slots'are inserted through yoke members 30 and drawn tightly to the tubes by means of nuts 31. The tiles should bedrawn'to tubes with'suflicient up pressure to secure a good heat transfer between the tiles and the tubes. The lower header 22 is protected from direct contact with the refuse by means of a. deflecting plate I 33 secured thereto.

, supply of water to the tubes 23. The header 21 may be connected with the boiler 14 in such manner that the headers 21 and 22 and tubes 23 form a part of the heat absorbing surface thereof. In Figs. 1 and 2, the header 21 is shown connected to the boiler proper M by nipples '36. The header 22 is supported intermediate its ends in any"- convenient manner, as, for example, by a beam member 42 embedded within a bridge wall 43 of the furnace.

Should it be desired to admit air to aid in the combustion, this is done by forming suitable apertures in the wall, either by the omission of certain tiles or by the provision of apertures in the tiles. These apertures serve to admit air which may be drawn in by the draft through the furnace or may supply air under forced draft, Tn the latter case, the air under pressure is led to the space between the wall 25 and the outer casing 78 of the clinker pit by a suitable duct 79 and dis charged through the refuse therein.

As a further protection for the wall T may admit cooling fluid directly into the refuse. Preferably T have a header 90 from which pipes 91 lead into the refuse,

my invention, its operation is now briefly outlined. Fuel is burned on the stoker in the usual manner. enters theclinker pit in an incandescent condition, the slag content thereof being in a molten state. Where the molten slag contacts with the relatively cool rear wall 12, its

surface is solidified immediately, forming a" glass-like crust which has no adhesivef affinity for the refractory tiles. iThe heat of the refuse absorbed by the tiles'is continuously carried away by the water circulating in the tubes 23, and (the temperature of the tile is thus maintained s'ufficiently low to prevent adhesions of hot clinker thereto. The

' wall 12 extends upwardly above the surface of the refuse to the boiler for the dual purpose of maintaining the wall at temperatures which resist the erosive action of the gases and of conserving, the heat absorbed by the refractory lining of the wall.

In Fig.4, -I havashown a modification in I which a different manner of securing tiles 48 to the tubes is employed. T fr'"" tiles 48 are identical in general contour wlth those al- Having thus described an embodiment of The refuse of the fuel woman ready described. They differ in that cored openings 49 are formed in the central portions of the tiles which openings are countersunk at 50 to receive the bolt heads of the .securing bolts 51. Angle irons 52, hearing against the tubes 23, extend the width of the furnace behind each row of tiles-and nuts 53 draw the tiles in close contact to thetubes. Alignment of the tubes and of the exposed surfaces of the tile is thus assured. When the tiles 48,have been secured in place, the countersunk portions of the openings 48 are filled with a suitable fire cement,

Fig. 5 shows a modified form of tile which is particularly adapted for construction from cast iron. The tiles 55 flare at the ends exposed to the heat of the furnace to conform to the contour of. the tubes 23 against whichthe-tiles rest and are made only of sufficient width to ensure a firm gripping of the tiles upon the tubes. This arrangement leaves a larger part of the tube surface on the furnace side exposed directly to the heat of the furnace andprovides a wall of high durability and to which slag or clinkerwill not adhere. r p

Fig. 6 shows a further modification bf the wall structure in whicha plurality of rows of tubes is employed. In addition to the row of tubes 23 a second row of tubes 80 is used.

The tubes 80 may be placed in any relation to the tubes '23 but are preferably placed opposite the intervals between the tubes 23. T have shown the wall in this case-as being made of a. plastic refractory 81, as fire clay, but it is obvious that tiles or tiles backed bya plastic refractory may be used. I

The header 22 is shown in Fig. 1 as being ppsitioned between the bridge wall 43 of the rnaceand the clinker grinder rolls 18, 18.

It is to be'observed however, that, in so far as certain aspects of m invention are con- 1 cerned, it is not limits to the specific arrangement shown, for the header 22 mi ht equallyas well be located in any place which is adjacent to or in the vicinity of the rolls, 18, 18, and still aid in performing the useful functions of my apparatus. f

While I have shown my invention in several forms, it will be obvious to those sln'lled in the art that it is'not so limited, but is sus= ceptible of various other changes and modifications, without d'epartin from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

1. In a furnace, the combination of a boiler having a rear header; a progressive feed stoker; a clinker pit extendin arranged to receive the refuse om thedischarge end of-the stoker; clinker. grindermeans disposed within the lower portion of the pit; said pit including a rear wall comllli below and chamber, and a refuse clinker grinder means arranged in the lower prising a plurality of spaced substantially upright water tubes, a header extending along the bottom of the pit at the rear thereof and connecting the lower end of the water tubes, refractory material engaging the tubes and forming a contacting surface for the refuse within the pit, and means for deflecting refuse away from the lower header to protect it from the abrasive action ofthe refuse; and means providing communication between the spaced tubes and the rear header of the boiler. Y

2. The combination with a boiler having a rear header, means providing a furnace clinker pit having portion thereof; of a water-cooled wall for the rear side of both the chamber and pit and including upper and lower headers, tubes connecting the headers, means for connecting the upper header to said boiler header, said upper header being exposed to the furnace chamher, and refractory material carried by the tubes at the furnace chamber side and providing an interior clinker pit surface.

3. In a furnace, the combination of a boiler; a progressive feed stoker; a clinker pit extending below and arranged to receive the refuse from the discharge end of the stoker; means disposed within the lower portion of the pit for grinding out the refuse; the pit having a rear water wall including a plurality of spaced, substantially upright water tubes, a header connecting the lower ends of the tubes and disposed adjacent the refuse grinding means, and refractory material engaging tacting and heat-absorbing surface for the hot refuse within the pit; and means providing communication between the spaced tubes and the boiler.

4. In a furnace, the combination of a boiler; a progressive feed stoker; a clinker pit extending below and arranged to receive the refuse from the discharge end of the stoker; means within the lower portion of the pit for grinding out the refuse; the pit having a rear water wall including a plurality of spaced, substantially upright water tubes, a header connecting the lower ends of the tubes and disposed adjacent the refuse grinding means, and refractory material engaging the tubes and providing a contacting and heat-absorb ing surface for the hot refuse within the pit; the upper ends of the tubes with refractory material thereon extending upwardly within the furnace to provide the rear wall for the furnace; a header connecting the upper ends of the tubes; and means providing communication between the last-named header and the boiler.

In testimony whereof, I have hereunto subscribed my name this 12th day of May, 1924.

1 ROBERT A. FORESMAN.

the tubes and providing a con- 7 

